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Share-based payments - Summary of Changes in Options (Detail) | 12 Months Ended
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Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |  |
Weighted average exercise price, Beginning balance | $ 2.05 | $ 1.10
Weighted average exercise price, Issuance of options | 8.23 | 2.82
Weighted average exercise price, Exercise of options | 1.41 | 1.03
Weighted average exercise price, Cancellation of warrants | 2.43 | 1.15
Weighted average exercise price, Vesting of issued options | 2.28 | 1.71
Weighted average exercise price, Ending balance | $ 2.99 | $ 2.05
Number of options, Beginning balance | shares | 11,603,750 | 6,177,594
Number of options, Issuance of options | shares | 1,910,000 | 6,402,000
Number of options, Exercise of options | shares | (597,379) | (571,246)
Number of options, cancellation of warrants options | shares | (13,376) | (404,598)
Number of options, Vesting of issued options | shares | 5,648,656 |
Number of options, Ending balance | shares | 12,902,995 | 11,603,750
Share options, Beginning balance | $ 2,289,000 | $ 735,000
Share options, Exercise of options | (286,000) | (308,000)
Share options, Vesting of issued options | 4,238,000 | 1,862,000
Share options, Ending balance | $ 6,241,000 | $ 2,289,000

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